chore(deps): change `dependabot` interval to `monthly`

[bednar]

Proposed Changes

Changed dependabot interval to monthly. The security updates aren't affected by this change.

Checklist

• [x] Rebased/mergeable
• [x] make test completes successfully
• [x] Commit messages are conventional
• [x] Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (f72f191) 74.86% compared to head (df87c30) 74.86%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #147 +/- ## ========================================= Coverage 74.86% 74.86% Complexity 424 424 ========================================= Files 25 25 Lines 1094 1094 ========================================= Hits 819 819 Misses 275 275 ```

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